the question is too hard .n（ ）can answer it.i waited for Brian to r（ ）,but he said nothing.
问题描述：
the question is too hard .n（ ）can answer it.i waited for Brian to r（ ）,but he said nothing.
答
nobody replynone 什么意思none"没有人或事”，一般放在 none of us , 这样的语境中运用，不独立做主语。